Join Date: Jan 2013
Location: New Orleans, La
Here is my cents and I know it will be ignored but here it goes. First, you need a trainer or at least someone who can help you with your horse. Rearing is the worst habit to break and once it becomes ingrained (at this sounds like it) it makes retraining a bit more difficult.
I'm still leaning on pain/tack fit, but for arguments sake, let's say tack and bit are just fine and she's got you buffaloed.
Start learning confidence and learn to instill confidence in the horse. I have a "confidence course" built but you can make your own and put it up and down as needed. I have 5 elements up at all times and another 10 that I rotate around. I always start with an easier task and build up to more difficult questions and then back off with an easier element.
1) walk over 4-5 poles over the ground
2) walk over 5 poles set up in a star pattern (use a dressage whip or driving whip to encourage the horse to bend and use her body.
3) walk over pool noodles on the ground
4) have those used car sales flag runners set up in a 10' aisle (flags on both sides)
5) end with poles over ground
I have more elements from those statue geese, mail box (with balloons) and I have pool noodles set up for them to push through also. Tarps, have plywood on the ground, (simulates a bridge) and other obstacles.
Work on the ground with this course until you both can walk the course with no problems. Repeat with the addition of tack and bridle. Repeat with you riding.
If she starts to rise stay off her mouth and keep your balance, as soon as she hits the ground move her forward. Horses can't normally rear while moving so keep her feet in gear, never give her the opportunity to rear.
Horses just do not rear for no reason, pain and fear are the normal culprits, have her teeth, back, and feet checked out by a massage therapist and get a more experienced rider to help you through this.